How do downgrade back to V.1.50

I installed New firmware v2.0.15, but works not well. Could I know how to do back to V.1.5.0 verion ? V.1.50 I work fine to me . Now the system version New firmware v2.0.15 can I change back to old version, is only upgrade system, can i back to old version v. 1.5.0, how to do this?

 

here :

http://forum.zidoo.tv/index.php?threads/zidoo-x10-review-updated-to-2-0-5.5596/page-6#post-35587



and here

http://forum.zidoo.tv/index.php?threads/how-to-flash-zidoo-x9s-unit.2959/

 

I turn back manufacturer setting. Same ver 2.0.15 it work fine now.